US20070146828A1 - Image reading apparatus including auto document feeder - Google Patents
Image reading apparatus including auto document feeder Download PDFInfo
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- US20070146828A1 US20070146828A1 US11/601,637 US60163706A US2007146828A1 US 20070146828 A1 US20070146828 A1 US 20070146828A1 US 60163706 A US60163706 A US 60163706A US 2007146828 A1 US2007146828 A1 US 2007146828A1
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- document
- elastic ribs
- body unit
- flat glass
- glass plane
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
- H04N1/121—Feeding arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
- H04N1/121—Feeding arrangements
- H04N1/123—Using a dedicated sheet guide element
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
- H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
- H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
- H04N1/193—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line using electrically scanned linear arrays, e.g. linear CCD arrays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/0077—Types of the still picture apparatus
- H04N2201/0081—Image reader
Definitions
- An aspect of the present invention relates to an image reading apparatus, and, more particularly, to an image reading apparatus including an automatic document feeder (ADF) by which an image is read while a document is moved.
- ADF automatic document feeder
- the image reading apparatuses include a scanning module for reading a document.
- the scanning module scans light onto a document to read the visible image printed on the document, converts an optical signal reflected from the document into an electrical signal, and transmits the electrical signal to a signal process module provided in the image reading apparatus.
- An ADF is placed on the flat glass to move the document.
- the scanning module that is disposed on the rear surface of the flat glass reads an image from the document.
- the scanning module reads an image of a document based on the difference between the amounts of the light scanned and reflected from the document. The more the amount of the reflected light, the whiter the image read from the document is perceived.
- a margin of a document refers to the area that extends beyond the width of the document.
- the margin of the document is read as being black. This is because the light scanned onto the margin of the document is not reflected to the image sensor and instead diverges around the image sensor.
- a contact member is formed to prevent this effect.
- the contact member is elastically biased by elastic members and presses the document to closely adhere to the flat glass.
- the elastic members should be placed at regular intervals in the main scanning direction, and the elasticity coefficient, length, and outer circumference of each of the elastic members must be substantially equal to each other.
- An aspect of the present invention provides an image reading apparatus including an auto document feeder (ADF) that has a plurality of elastic ribs to replace additional elastic members such that a contact member is formed of one component with the elastic ribs and is assembled easily and presses a document with a uniform elastic force without the need for an additional assembly process.
- ADF auto document feeder
- an image reading apparatus comprising: a scanning unit including a flat glass plane and a scanning module disposed on a rear surface of the flat glass plane to allow for a reading of a document in a main scanning direction; and an auto document feeder (ADF) that is disposed on an upper surface of the flat glass plane and which moves the document in a sub-scanning direction relative to the scanning unit, the sub-scanning direction being perpendicular to the main scanning direction, wherein the ADF includes: a contact member having a body unit that faces the scanning unit and biases the document toward the flat glass plane, and a plurality of elastic ribs that elastically bias the body unit toward the flat glass plane and which are integrally formed with the body unit.
- ADF auto document feeder
- the body unit may have an extended portion longer than the width of the document in a main scanning direction in order to read a margin of the document as white and the elastic ribs may elastically push the body unit including the extended portion toward the margin of the document.
- the elastic ribs may be separated a constant distance along the main scanning direction, and the elastic force may be substantially uniformly distributed along the main scanning direction.
- the elastic ribs may be beam-shaped and both ends of each of the elastic ribs may be coupled with a rear surface of the body unit.
- the contact member may be elastically inserted into fixing grooves of the ADF, and the contact member may further comprise fixing hooks protruding at both ends of the body unit.
- FIG. 1 is a lateral cross-sectional view of an image reading apparatus according to an embodiment of the present invention
- FIG. 2 is a perspective view of the image reading apparatus of FIG. 1 ;
- FIG. 3 is a lateral cross-sectional view of the image reading apparatus of FIG. 1 ;
- FIG. 4A is a cross-sectional view of a contact member in the image apparatus of FIG. 1 according to an embodiment of the present invention
- FIG. 4B is a perspective view of the contact member of FIG. 4A ;
- FIG. 4C is a cross-sectional view along line A-A′ of FIG. 4B ;
- FIG. 5A is a perspective view of a contact member in the image apparatus of FIG. 1 according to another embodiment of the present invention.
- FIG. 5B is a perspective view of the contact member of FIG. 5A ;
- FIG. 6 is a perspective view of a contact member according to another embodiment of the present invention.
- FIG. 1 is a lateral cross-sectional view of an image reading apparatus according to an embodiment of the present invention
- FIG. 2 is a perspective view of the image reading apparatus of FIG. 1
- FIG. 3 is a lateral cross-sectional view of the image reading apparatus of FIG. 1 .
- the image reading apparatus in FIGS. 1 and 2 is a multi-functional printer, according to an embodiment of the present invention, which is able to scan and print an image separately or at the same time.
- the image reading apparatus includes a printing unit 100 and a scanning unit 99 .
- the printing unit 100 prints an image by employing an electro-photographic method.
- the scanning unit 99 is of a hybrid type of a scanning unit and includes an auto document feeder (ADF) 10 .
- ADF auto document feeder
- the scanning unit 99 reads an image in either a flat-bed or a sheet-feed manner.
- the printing unit 100 includes an optical scanning unit 180 , a developing cartridge 140 , a fixing unit 160 , and a paper feeding cassette 110 .
- the x-axis of FIGS. 1 and 2 represents a sub-scanning direction in which a recording medium P or a document S is discharged.
- the y-axis of FIGS. 1 and 2 represents a main scanning direction and is perpendicular to the sub-scanning direction.
- the printing unit 100 prints an image by employing an inkjet method or a dye-sublimation method according to embodiments of the present invention.
- the optical scanning unit 180 forms an electrostatic latent image on an outer circumference of a photosensitive body 142 by scanning light corresponding to image information onto the photosensitive body 142 .
- a developing cartridge 140 is detachably installed in a main body 101 of the printing unit 100 .
- the developing cartridge 140 includes a charging roller 141 , a photosensitive body 142 , a developing roller 143 , a supplying roller 144 , an agitator 145 , and a toner storage body 146 .
- the toner storage body 146 stores toner.
- the developing cartridge 140 may be replaced when the toner stored in the toner storage body 146 is completely consumed.
- the developing cartridge 140 is installed in the main body 101 of the printing unit 100 via a pushing of a handle 147 in a negative direction of the x-axis and is separated from the main body 101 of the printing unit 100 via a pulling of the handle 147 in a positive direction of the x-axis.
- the photosensitive body 142 is installed such that a portion of the outer circumference thereof is exposed and rotated in a predetermined direction.
- a photoconductive material layer coats the outer circumference of the photosensitive body 142 as a result of, for example, a deposition method.
- the photosensitive body 142 is charged with a predetermined potential by the charging roller 141 and an electrostatic latent image corresponding to the image to be printed is formed on the outer circumference of the photosensitive body 142 by the light emitted from the optical scanning unit 180 .
- Solid powder toner at first adheres to a surface of the developing roller 143 and then the toner, which is attracted to the photosensitive body 142 due to the charging thereof, and which is repelled by a developing bias voltage that is applied to the developing roller 143 , is attached to the electrostatic latent image formed on the photosensitive body 142 to develop the electrostatic latent image into a toner image.
- the outer circumferences of the developing roller 143 and the photosensitive body 142 contact each other and form a developing nip at the contact points or the outer circumferences are separated apart from each other and form a developing gap therebetween.
- the developing nip or gap should be formed along the axis of the developing roller 143 or the axis of the photosensitive body 142 to have a predetermined size. The toner is then moved through the developing gap or nip.
- the supplying roller 144 supplies toner to the developing roller 143 .
- the agitator 145 agitates the toner so that the toner in the toner storage body 146 does not solidify and transports the toner to the supplying roller 144 .
- a transfer roller 150 faces the outer circumference of the photosensitive body 142 and a transfer bias voltage having an opposite polarity to that of the toner image is applied to the transfer roller 150 so that the toner image developed by the photosensitive body 142 is transferred to the recording medium P.
- the toner image is transferred to the recording medium P by an electrostatic force and by mechanical contact pressure between the photosensitive body 142 and the transfer roller 150 .
- the fixing unit 160 includes a heat roller (not shown) and a pressure roller (not shown) that face each other and which supply heat and pressure to the toner image transferred to the recording medium P to fix the toner image on the recording medium P by an application of the heat and pressure.
- a discharging roller 170 discharges the recording medium P to an exterior of the printing unit 100 once printing is completed on one or both sides of the recording medium P.
- the recording medium P having been discharged to the exterior of the printing unit 100 , is stacked in a discharging tray 300 .
- the moving path of the recording medium P through the image forming apparatus is as follows.
- the printing unit 100 includes a paper feeding cassette 110 , in which the recording medium P is stored.
- a pick up roller 120 picks up and draws out each recording medium P stored in the paper feeding cassette 110 in a sheet by sheet sequence.
- a feed roller 130 transports the picked up recording medium P toward the developing cartridge 140 .
- the recording medium P then passes between the photosensitive body 142 and the transfer roller 150 so that the toner image is transferred thereon.
- the toner image, having been transferred onto the recording medium P, is fixed thereon by an application of the heat and pressure of the fixing unit 160 .
- the recording medium P is discharged to the discharging tray 300 by the discharging roller 170 .
- the scanning unit 99 includes a scanning module 90 that scans light to read an image of a document S, flat glass planes 50 and 51 on which the document S to be scanned is placed, and an ADF 10 that automatically feeds recording media to be scanned.
- the x-axis direction of FIGS. 1 , 2 and 3 represents a sub-scanning direction in which the scanning module 90 moves when reading an image
- the y-axis direction of FIGS. 1 , 2 and 3 represents a main scanning direction in which the scanning module 90 reads an image of the document S.
- the first flat glass plane 50 initially contacts a document S that is being transported by the ADF 10 and the document S is laid still on a second flat glass plane 51 .
- the first and second flat glass planes 50 and 51 are separated from each other.
- a document guide member 70 is formed between the ends of the first and second flat glass planes 50 and 51 to guide the document S from the first glass plane 50 to the second glass plane 51 .
- a display panel 40 displays the operational state of the printing unit 100 and the scanning unit 99 and includes several kinds of operation keys.
- a document S stacked on a feeding plate 20 , is transported to the first glass plane 50 by the ADF 10 .
- the scanning module 90 which is stopped on a rear surface of the first flat glass plane 50 , reads the image recorded on the document S.
- the read document S is then discharged to a discharging plate 30 .
- the scanning module 90 When the document S is supplied separately from other documents and not automatically by the ADF 10 , the document S is placed by a user on an upper surface of the second flat glass plane 51 .
- the scanning module 90 is then moved on the rear surface of the second flat glass plane 51 in the sub-scanning direction and reads the image of the stopped document S.
- the scanning module 90 When the scanning module 90 is disposed on the rear surface of the first flat glass plane 50 , the scanning module 90 reads the document S that is transported by the ADF 10 , and when the scanning module 90 is disposed on the rear surface of the second flat glass plane 51 , the scanning module 90 reads the stopped document S.
- the scanning unit 99 is not limited to the above construction and may be constructed in various ways.
- the ADF 10 includes a transporting unit (not shown) and a contact member 600 .
- the transporting unit includes a first roller 510 , a second roller 520 , a third roller 530 , and a guide 540 .
- the first roller 510 picks up the document S from the top of the stack of documents S stacked on the feeding plate 20 in a sheet by sheet sequence.
- At least one second roller 520 is used to transport the document S picked up by the first roller 510 to an upper surface of the first flat glass plane 50 .
- the scanning module 90 reads the document S transported to the upper surface of the flat glass plane 50 , and the third roller 530 discharges the read document S to the discharging plate 30 .
- a guide 540 guides the document S along this path.
- FIGS. 4A through 6 illustrate the contact member 600 according to various embodiments of the present invention.
- the contact member 600 includes a body unit 610 and elastic ribs 630 a , 630 b , and 630 c.
- the body unit 610 biases the document S to closely contact the upper surface of the flat glass plane 50 due to the elasticity of the elastic ribs 630 a , 630 b , and 630 c .
- a rear surface of the body unit 610 contacting the document S is white, and the body unit 610 is extended to be longer than the maximum width of the readable document S.
- a white sticker may be attached on the rear surface of the body unit 610 contacting the document S.
- the length of the body unit 610 in the main scanning direction should be at least long and/or large enough to extend beyond the edges of A3 size paper.
- the body unit 610 may be elastically deformed according to the width of the document S in the main scanning direction. If the body unit 610 is rigid, a thick document S would not reliably contact the flat glass plane 50 and might even come off the flat glass plane 50 along a z-axis direction of FIGS. 1 , 2 and 3 . If a gap between the flat glass plane 50 and the body unit 610 increases, the margin of the document S may be read as gray or black. To prevent this, the body unit 610 may be formed of a material having a predetermined elasticity. Accordingly, the body unit 610 may be bent along the y-axis, thus forming a z-axis step between a portion contacting the document S and a portion covering the margin of the document S. The more the portion of the body unit 610 covering the margin of the document S contacts a larger area of the flat glass plane 50 , the more light is easily reflected. Thus, a white image may be more effectively read.
- the elastic ribs 630 a , 630 b , and 630 c are formed integrally with the body unit 610 and elastically bias the body unit 610 toward the document S and the flat glass plane 50 .
- the contact member 600 includes the body unit 610 and the elastic ribs 630 a , 630 b , and 630 c that are formed as one unit. As shown in FIG. 3 , when a contact member 600 is assembled in the ADF 10 , fixing hooks 620 protruding at both ends of the body unit 610 may be elastically inserted into fixing grooves 502 formed in the ADF 10 .
- the fixing hooks 620 may be moved within the height of the fixing grooves 502 in the z-axis direction. Accordingly, when the body unit 610 and the elastic ribs 630 a , 630 b , and 630 c are elastically deformed, the fixing hooks 620 are prevented from contacting and entering into the fixing grooves 502 in the z-axis direction. As the fixing hooks 620 protrude in the z-axis direction and generate an elastic force in the x-axis direction, they are elastically inserted into the fixing grooves 502 . Since an end of each of the fixing hooks 620 is bent in the x-axis direction, once the fixing hooks 620 are inserted into the fixing grooves 502 , the fixing hooks 620 are not easily separated from the fixing grooves 502 .
- the properties of the elastic ribs 630 a , 630 b , and 630 c may be controlled uniformly. Thus, the assembling processes and the assembling costs of the contact member 600 may be reduced.
- the contact member 600 may be formed of synthetic resin having a predetermined elasticity.
- the elastic ribs 630 a , 630 b , and 630 c may be formed of the same material as the body unit 610 during the same injection molding process.
- the elastic ribs 630 a , 630 b , and 630 c may be formed in various shapes and in different positions with respect to the body unit 610 .
- the illustrated elastic ribs 630 a , 630 b , and 630 c are only an example and the present invention is not limited thereto.
- FIGS. 4A through 4C includes a cantilever-shaped elastic rib 630 a .
- FIG. 4A shows a cross-sectional view of the contact member 600 in the image apparatus of FIG. 1 according to an embodiment of the present invention
- FIG. 4B is a perspective view of the contact member 600 of FIG. 4A
- FIG. 4C is a cross-sectional view along line A-A′ of FIG. 4B .
- a first end of the elastic rib 630 a contacts the rear surface of the body unit 610 and a second end of the elastic rib 630 a contacts a control unit 503 formed in a main body 502 of the ADF.
- the elastic rib 630 a is bent in the y-axis direction, thereby elastically biasing the body unit 610 .
- a space 640 is formed between the rear surface of the elastic rib 630 a and the upper surface of the body unit 610 .
- the elastic rib 630 a is elastically deformed in the space 640 .
- the contact member 600 in FIGS. 5A through 5C includes an elastic rib 630 b that is shaped as a double ended supporting beam.
- FIG. 5A is a perspective view of the contact member 600 in the image apparatus of FIG. 1 according to another embodiment of the present invention
- FIG. 5B is a perspective view of the contact member 600 of FIG. 5A
- FIG. 5C is a cross-sectional view cut along a line B-B′ of FIG. 5B .
- Both ends of the elastic rib 630 b are connected to both sides of the body unit 610 in the x-axis direction.
- the center of the elastic rib 630 b contacts a regulation unit 503 formed in the main body of the ADF 10 .
- the elastic rib 630 b When the body unit 610 contacts the document S or the flat glass plane 50 , the elastic rib 630 b is bent in the x-axis direction, thereby elastically biasing the body unit 610 in the x-axis direction.
- the elastic rib 630 b is elastically bent in the space 640 .
- the core of the mold is thus separated toward the x-axis.
- the contact member 600 may be easily mass-produced.
- the contact member 600 illustrated in FIG. 6 also includes an elastic rib 630 c that is shaped as a double ended supporting beam. Both ends of the elastic rib 630 c are connected onto a rear surface of the body unit 610 in the y-axis direction. When the body unit 610 contacts the document S or the flat glass plane 50 , the elastic rib 630 c is bent in the y-axis direction, thereby elastically biasing the body unit 610 . During the injection molding process of the contact member 600 , the core of the mold is thus separated toward the x-axis. Thus, the contact member 600 may be easily mass-produced.
- the description hereinafter is made with reference to FIGS. 3 through 6 .
- the elastic ribs 630 a , 630 b , and 630 c elastically bias the body unit 610 covering the document S to closely adhere the document S to the flat glass plane 50 .
- the elastic ribs 630 a , 630 b , and 630 c elastically bias an extended portion of the body unit 610 that contacts the margin of the document S to reduce the gap between the body unit 610 and the flat glass plane 50 .
- a plurality of the elastic ribs 630 a , 630 b , and 630 c are separated by a predetermined distance along the main scanning direction from each other.
- the elastic force which affects the body unit 610 is controlled according to the number of the elastic ribs 630 a , 630 b , and 630 c . Since the elastic ribs 630 a , 630 b , and 630 c are formed at a regular interval along the main scanning direction, the elastic force of the ribs 630 a , 630 b , and 630 c is uniformly distributed along the main scanning direction. Accordingly, a skewing of the document S is prevented.
- the body unit 610 of the image reading apparatus includes, according to aspects of the present invention, the elastic ribs 630 a , 630 b , and 630 c formed integrally with the body unit 610 , the number of the manufacturing processes for the contact member 600 and the cost for controlling the quality thereof may be reduced. Since one contact member is provided, the contact member may be easily assembled in the ADF and biases the document S with a uniform elastic force, thereby preventing a reading malfunction of the image reading apparatus and making it possible to read the margin of a thick document as white.
Abstract
Description
- This application claims the benefit of Korean Patent Application No. 2005-128702, filed on Dec. 23, 2005 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
- 1. Field of the Invention
- An aspect of the present invention relates to an image reading apparatus, and, more particularly, to an image reading apparatus including an automatic document feeder (ADF) by which an image is read while a document is moved.
- 2. Description of the Related Art
- Generally, an image reading apparatus reads an image printed on a document by scanning light onto the document and converting an optical signal generated from that light into an electric signal. Scanners, facsimiles, and multi-functional printers are examples of image reading apparatuses.
- The image reading apparatuses include a scanning module for reading a document. The scanning module scans light onto a document to read the visible image printed on the document, converts an optical signal reflected from the document into an electrical signal, and transmits the electrical signal to a signal process module provided in the image reading apparatus.
- Generally, either the scanning module or the document is moved. An image reading apparatus in which the scanning module is moved is referred to as a flat-bed type image reading apparatus. An image reading apparatus in which the document is moved is referred to as a sheet-feed type image reading apparatus. In addition, a flat-bed type image reading apparatus including an auto document feeder (ADF) is referred to as a hybrid type image reading apparatus.
- The image reading apparatus includes a flat glass plane on which a document is placed and a scanning module that is disposed below the flat glass plane. The scanning module includes an optical scanning unit to scan light onto the document and an image sensor to convert an optical signal obtained by the reading of the document into an electric signal.
- The optical scanning unit includes a light source that scans light from the rear surface of the flat glass plane onto the document. The light source may be a halogen lamp placed along a main scanning direction of the document. Hereinafter, a sub scanning direction indicates the direction in which a document is moved and the main scanning direction indicates the direction perpendicular to the sub-scanning direction.
- The image sensor unit includes an image sensor such as a charge-coupled device (CCD) sensor or a contact image sensor (CIS) and a control board to control the operation of the image sensor.
- An ADF is placed on the flat glass to move the document. The scanning module that is disposed on the rear surface of the flat glass reads an image from the document. In a mono-color image reading apparatus, the scanning module reads an image of a document based on the difference between the amounts of the light scanned and reflected from the document. The more the amount of the reflected light, the whiter the image read from the document is perceived.
- Hereinafter, a margin of a document refers to the area that extends beyond the width of the document. When the width of the document is smaller in the sub-scanning direction than the length of the scanning module, the margin of the document is read as being black. This is because the light scanned onto the margin of the document is not reflected to the image sensor and instead diverges around the image sensor. A contact member is formed to prevent this effect. The contact member is elastically biased by elastic members and presses the document to closely adhere to the flat glass. In order to uniformly press the document, the elastic members should be placed at regular intervals in the main scanning direction, and the elasticity coefficient, length, and outer circumference of each of the elastic members must be substantially equal to each other. Thus, the assembly process of the image reading apparatus becomes complicated and the cost to control the quality of image scanning increases.
- An aspect of the present invention provides an image reading apparatus including an auto document feeder (ADF) that has a plurality of elastic ribs to replace additional elastic members such that a contact member is formed of one component with the elastic ribs and is assembled easily and presses a document with a uniform elastic force without the need for an additional assembly process.
- According to an aspect of the present invention, there is provided an image reading apparatus comprising: a scanning unit including a flat glass plane and a scanning module disposed on a rear surface of the flat glass plane to allow for a reading of a document in a main scanning direction; and an auto document feeder (ADF) that is disposed on an upper surface of the flat glass plane and which moves the document in a sub-scanning direction relative to the scanning unit, the sub-scanning direction being perpendicular to the main scanning direction, wherein the ADF includes: a contact member having a body unit that faces the scanning unit and biases the document toward the flat glass plane, and a plurality of elastic ribs that elastically bias the body unit toward the flat glass plane and which are integrally formed with the body unit.
- The body unit may have an extended portion longer than the width of the document in a main scanning direction in order to read a margin of the document as white and the elastic ribs may elastically push the body unit including the extended portion toward the margin of the document.
- The body unit may be elastically deformed according to the thickness of the document.
- The plurality of elastic ribs may be separated apart from each other, and the magnitude of the elastic force of the elastic ribs may vary according to the number of the elastic ribs.
- The elastic ribs may be separated a constant distance along the main scanning direction, and the elastic force may be substantially uniformly distributed along the main scanning direction.
- The elastic ribs may be cantilever-shaped, bending along the main scanning direction, and one end of each of the elastic ribs may be coupled with a rear surface of the body unit.
- The elastic ribs may be beam-shaped and both ends of each of the elastic ribs may be coupled with a rear surface of the body unit.
- The contact member may be elastically inserted into fixing grooves of the ADF, and the contact member may further comprise fixing hooks protruding at both ends of the body unit.
- The contact member may be formed of a synthetic resin having a predetermined elasticity in an injection molding process.
- Additional and/or other aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
- These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
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FIG. 1 is a lateral cross-sectional view of an image reading apparatus according to an embodiment of the present invention; -
FIG. 2 is a perspective view of the image reading apparatus ofFIG. 1 ; -
FIG. 3 is a lateral cross-sectional view of the image reading apparatus ofFIG. 1 ; -
FIG. 4A is a cross-sectional view of a contact member in the image apparatus ofFIG. 1 according to an embodiment of the present invention; -
FIG. 4B is a perspective view of the contact member ofFIG. 4A ; -
FIG. 4C is a cross-sectional view along line A-A′ ofFIG. 4B ; -
FIG. 5A is a perspective view of a contact member in the image apparatus ofFIG. 1 according to another embodiment of the present invention; -
FIG. 5B is a perspective view of the contact member ofFIG. 5A ; -
FIG. 5C is a cross-sectional view cut along a line B-B′ ofFIG. 5B ; and -
FIG. 6 is a perspective view of a contact member according to another embodiment of the present invention. - Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
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FIG. 1 is a lateral cross-sectional view of an image reading apparatus according to an embodiment of the present invention;FIG. 2 is a perspective view of the image reading apparatus ofFIG. 1 ; andFIG. 3 is a lateral cross-sectional view of the image reading apparatus ofFIG. 1 . - The image reading apparatus in
FIGS. 1 and 2 is a multi-functional printer, according to an embodiment of the present invention, which is able to scan and print an image separately or at the same time. The image reading apparatus includes aprinting unit 100 and ascanning unit 99. Theprinting unit 100 prints an image by employing an electro-photographic method. Thescanning unit 99 is of a hybrid type of a scanning unit and includes an auto document feeder (ADF) 10. Thescanning unit 99 reads an image in either a flat-bed or a sheet-feed manner. - The
printing unit 100 includes anoptical scanning unit 180, a developingcartridge 140, a fixingunit 160, and apaper feeding cassette 110. The x-axis ofFIGS. 1 and 2 represents a sub-scanning direction in which a recording medium P or a document S is discharged. The y-axis ofFIGS. 1 and 2 represents a main scanning direction and is perpendicular to the sub-scanning direction. Though not illustrated in the drawings, theprinting unit 100 prints an image by employing an inkjet method or a dye-sublimation method according to embodiments of the present invention. - The
optical scanning unit 180 forms an electrostatic latent image on an outer circumference of aphotosensitive body 142 by scanning light corresponding to image information onto thephotosensitive body 142. - A developing
cartridge 140 is detachably installed in amain body 101 of theprinting unit 100. According to an embodiment of the present invention, the developingcartridge 140 includes a chargingroller 141, aphotosensitive body 142, a developingroller 143, a supplyingroller 144, anagitator 145, and atoner storage body 146. Thetoner storage body 146 stores toner. The developingcartridge 140 may be replaced when the toner stored in thetoner storage body 146 is completely consumed. During replacement, the developingcartridge 140 is installed in themain body 101 of theprinting unit 100 via a pushing of ahandle 147 in a negative direction of the x-axis and is separated from themain body 101 of theprinting unit 100 via a pulling of thehandle 147 in a positive direction of the x-axis. - The
photosensitive body 142 is installed such that a portion of the outer circumference thereof is exposed and rotated in a predetermined direction. A photoconductive material layer coats the outer circumference of thephotosensitive body 142 as a result of, for example, a deposition method. Thephotosensitive body 142 is charged with a predetermined potential by the chargingroller 141 and an electrostatic latent image corresponding to the image to be printed is formed on the outer circumference of thephotosensitive body 142 by the light emitted from theoptical scanning unit 180. - Solid powder toner at first adheres to a surface of the developing
roller 143 and then the toner, which is attracted to thephotosensitive body 142 due to the charging thereof, and which is repelled by a developing bias voltage that is applied to the developingroller 143, is attached to the electrostatic latent image formed on thephotosensitive body 142 to develop the electrostatic latent image into a toner image. The outer circumferences of the developingroller 143 and thephotosensitive body 142 contact each other and form a developing nip at the contact points or the outer circumferences are separated apart from each other and form a developing gap therebetween. The developing nip or gap should be formed along the axis of the developingroller 143 or the axis of thephotosensitive body 142 to have a predetermined size. The toner is then moved through the developing gap or nip. - The supplying
roller 144 supplies toner to the developingroller 143. Theagitator 145 agitates the toner so that the toner in thetoner storage body 146 does not solidify and transports the toner to the supplyingroller 144. - A
transfer roller 150 faces the outer circumference of thephotosensitive body 142 and a transfer bias voltage having an opposite polarity to that of the toner image is applied to thetransfer roller 150 so that the toner image developed by thephotosensitive body 142 is transferred to the recording medium P. The toner image is transferred to the recording medium P by an electrostatic force and by mechanical contact pressure between thephotosensitive body 142 and thetransfer roller 150. - The fixing
unit 160 includes a heat roller (not shown) and a pressure roller (not shown) that face each other and which supply heat and pressure to the toner image transferred to the recording medium P to fix the toner image on the recording medium P by an application of the heat and pressure. - A discharging
roller 170 discharges the recording medium P to an exterior of theprinting unit 100 once printing is completed on one or both sides of the recording medium P. The recording medium P, having been discharged to the exterior of theprinting unit 100, is stacked in a dischargingtray 300. - The moving path of the recording medium P through the image forming apparatus is as follows. The
printing unit 100 includes apaper feeding cassette 110, in which the recording medium P is stored. A pick uproller 120 picks up and draws out each recording medium P stored in thepaper feeding cassette 110 in a sheet by sheet sequence. Afeed roller 130 transports the picked up recording medium P toward the developingcartridge 140. The recording medium P then passes between thephotosensitive body 142 and thetransfer roller 150 so that the toner image is transferred thereon. The toner image, having been transferred onto the recording medium P, is fixed thereon by an application of the heat and pressure of the fixingunit 160. Then, the recording medium P is discharged to the dischargingtray 300 by the dischargingroller 170. - Referring to
FIGS. 2 and 3 , thescanning unit 99 includes ascanning module 90 that scans light to read an image of a document S, flat glass planes 50 and 51 on which the document S to be scanned is placed, and anADF 10 that automatically feeds recording media to be scanned. The x-axis direction ofFIGS. 1 , 2 and 3 represents a sub-scanning direction in which thescanning module 90 moves when reading an image and the y-axis direction ofFIGS. 1 , 2 and 3 represents a main scanning direction in which thescanning module 90 reads an image of the document S. - The first
flat glass plane 50 initially contacts a document S that is being transported by theADF 10 and the document S is laid still on a secondflat glass plane 51. The first and second flat glass planes 50 and 51 are separated from each other. Adocument guide member 70 is formed between the ends of the first and second flat glass planes 50 and 51 to guide the document S from thefirst glass plane 50 to thesecond glass plane 51. Adisplay panel 40 displays the operational state of theprinting unit 100 and thescanning unit 99 and includes several kinds of operation keys. - A document S, stacked on a
feeding plate 20, is transported to thefirst glass plane 50 by theADF 10. Thescanning module 90, which is stopped on a rear surface of the firstflat glass plane 50, reads the image recorded on the document S. The read document S is then discharged to a dischargingplate 30. - When the document S is supplied separately from other documents and not automatically by the
ADF 10, the document S is placed by a user on an upper surface of the secondflat glass plane 51. Thescanning module 90 is then moved on the rear surface of the secondflat glass plane 51 in the sub-scanning direction and reads the image of the stopped document S. When thescanning module 90 is disposed on the rear surface of the firstflat glass plane 50, thescanning module 90 reads the document S that is transported by theADF 10, and when thescanning module 90 is disposed on the rear surface of the secondflat glass plane 51, thescanning module 90 reads the stopped document S. Thescanning unit 99 is not limited to the above construction and may be constructed in various ways. - The
ADF 10 includes a transporting unit (not shown) and acontact member 600. The transporting unit includes afirst roller 510, asecond roller 520, athird roller 530, and aguide 540. Thefirst roller 510 picks up the document S from the top of the stack of documents S stacked on thefeeding plate 20 in a sheet by sheet sequence. At least onesecond roller 520 is used to transport the document S picked up by thefirst roller 510 to an upper surface of the firstflat glass plane 50. (Hereinafter, the firstflat glass plane 50 is referred to as aflat glass plane 50.) Thescanning module 90 reads the document S transported to the upper surface of theflat glass plane 50, and thethird roller 530 discharges the read document S to the dischargingplate 30. Aguide 540 guides the document S along this path. -
FIGS. 4A through 6 illustrate thecontact member 600 according to various embodiments of the present invention. Referring toFIGS. 3 through 6 , thecontact member 600 includes abody unit 610 andelastic ribs - The
body unit 610 biases the document S to closely contact the upper surface of theflat glass plane 50 due to the elasticity of theelastic ribs body unit 610 contacting the document S is white, and thebody unit 610 is extended to be longer than the maximum width of the readable document S. To this end, a white sticker may be attached on the rear surface of thebody unit 610 contacting the document S. - Further, if the image reading apparatus is to be required to be able to read a document having a maximum A3 size, the length of the
body unit 610 in the main scanning direction should be at least long and/or large enough to extend beyond the edges of A3 size paper. - The
body unit 610 may be elastically deformed according to the width of the document S in the main scanning direction. If thebody unit 610 is rigid, a thick document S would not reliably contact theflat glass plane 50 and might even come off theflat glass plane 50 along a z-axis direction ofFIGS. 1 , 2 and 3. If a gap between theflat glass plane 50 and thebody unit 610 increases, the margin of the document S may be read as gray or black. To prevent this, thebody unit 610 may be formed of a material having a predetermined elasticity. Accordingly, thebody unit 610 may be bent along the y-axis, thus forming a z-axis step between a portion contacting the document S and a portion covering the margin of the document S. The more the portion of thebody unit 610 covering the margin of the document S contacts a larger area of theflat glass plane 50, the more light is easily reflected. Thus, a white image may be more effectively read. - According to an embodiment of the invention, the
elastic ribs body unit 610 and elastically bias thebody unit 610 toward the document S and theflat glass plane 50. Thecontact member 600 includes thebody unit 610 and theelastic ribs FIG. 3 , when acontact member 600 is assembled in theADF 10, fixinghooks 620 protruding at both ends of thebody unit 610 may be elastically inserted into fixinggrooves 502 formed in theADF 10. - After being inserted into the fixing
grooves 502, the fixing hooks 620 may be moved within the height of the fixinggrooves 502 in the z-axis direction. Accordingly, when thebody unit 610 and theelastic ribs grooves 502 in the z-axis direction. As the fixing hooks 620 protrude in the z-axis direction and generate an elastic force in the x-axis direction, they are elastically inserted into the fixinggrooves 502. Since an end of each of the fixing hooks 620 is bent in the x-axis direction, once the fixing hooks 620 are inserted into the fixinggrooves 502, the fixing hooks 620 are not easily separated from the fixinggrooves 502. - Unlike the elastic member that is formed separately in the case of the conventional image reading apparatus, in the present embodiment, the properties of the
elastic ribs contact member 600 may be reduced. - According to an embodiment of the present invention, the
contact member 600 may be formed of synthetic resin having a predetermined elasticity. Theelastic ribs body unit 610 during the same injection molding process. Theelastic ribs body unit 610. The illustratedelastic ribs - The
contact member 600 illustrated inFIGS. 4A through 4C includes a cantilever-shapedelastic rib 630 a.FIG. 4A shows a cross-sectional view of thecontact member 600 in the image apparatus ofFIG. 1 according to an embodiment of the present invention;FIG. 4B is a perspective view of thecontact member 600 ofFIG. 4A ; andFIG. 4C is a cross-sectional view along line A-A′ ofFIG. 4B . A first end of theelastic rib 630 a contacts the rear surface of thebody unit 610 and a second end of theelastic rib 630 a contacts acontrol unit 503 formed in amain body 502 of the ADF. If thebody unit 610 contacts the document S or theflat glass plane 50, theelastic rib 630 a is bent in the y-axis direction, thereby elastically biasing thebody unit 610. Aspace 640 is formed between the rear surface of theelastic rib 630 a and the upper surface of thebody unit 610. Theelastic rib 630 a is elastically deformed in thespace 640. During the injection molding process of thecontact member 600, the core of the mold is thus separated toward the x-axis. Thus, thecontact member 600 may be easily mass-produced. - The
contact member 600 inFIGS. 5A through 5C includes anelastic rib 630 b that is shaped as a double ended supporting beam.FIG. 5A is a perspective view of thecontact member 600 in the image apparatus ofFIG. 1 according to another embodiment of the present invention;FIG. 5B is a perspective view of thecontact member 600 ofFIG. 5A ; andFIG. 5C is a cross-sectional view cut along a line B-B′ ofFIG. 5B . Both ends of theelastic rib 630 b are connected to both sides of thebody unit 610 in the x-axis direction. The center of theelastic rib 630 b contacts aregulation unit 503 formed in the main body of theADF 10. When thebody unit 610 contacts the document S or theflat glass plane 50, theelastic rib 630 b is bent in the x-axis direction, thereby elastically biasing thebody unit 610 in the x-axis direction. Theelastic rib 630 b is elastically bent in thespace 640. During the injection molding process of thecontact member 600, the core of the mold is thus separated toward the x-axis. Thus, thecontact member 600 may be easily mass-produced. - The
contact member 600 illustrated inFIG. 6 also includes anelastic rib 630 c that is shaped as a double ended supporting beam. Both ends of theelastic rib 630 c are connected onto a rear surface of thebody unit 610 in the y-axis direction. When thebody unit 610 contacts the document S or theflat glass plane 50, theelastic rib 630 c is bent in the y-axis direction, thereby elastically biasing thebody unit 610. During the injection molding process of thecontact member 600, the core of the mold is thus separated toward the x-axis. Thus, thecontact member 600 may be easily mass-produced. - The description hereinafter is made with reference to
FIGS. 3 through 6 . Theelastic ribs body unit 610 covering the document S to closely adhere the document S to theflat glass plane 50. Also, theelastic ribs body unit 610 that contacts the margin of the document S to reduce the gap between thebody unit 610 and theflat glass plane 50. A plurality of theelastic ribs body unit 610 is controlled according to the number of theelastic ribs elastic ribs ribs - As is described above, since the
body unit 610 of the image reading apparatus includes, according to aspects of the present invention, theelastic ribs body unit 610, the number of the manufacturing processes for thecontact member 600 and the cost for controlling the quality thereof may be reduced. Since one contact member is provided, the contact member may be easily assembled in the ADF and biases the document S with a uniform elastic force, thereby preventing a reading malfunction of the image reading apparatus and making it possible to read the margin of a thick document as white. - Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (23)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020050128702A KR100677625B1 (en) | 2005-12-23 | 2005-12-23 | Image reading apparatus including an auto document feeder |
KR10-2005-0128702 | 2005-12-23 | ||
KR2005-128702 | 2005-12-23 |
Publications (2)
Publication Number | Publication Date |
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US20070146828A1 true US20070146828A1 (en) | 2007-06-28 |
US7852528B2 US7852528B2 (en) | 2010-12-14 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/601,637 Expired - Fee Related US7852528B2 (en) | 2005-12-23 | 2006-11-20 | Image reading apparatus including auto document feeder |
Country Status (3)
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US (1) | US7852528B2 (en) |
KR (1) | KR100677625B1 (en) |
CN (1) | CN1988588A (en) |
Cited By (1)
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US20110032582A1 (en) * | 2009-08-04 | 2011-02-10 | Qisda (Suzhou) Co.,Ltd | Scanning device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US8520272B1 (en) * | 2012-02-29 | 2013-08-27 | Xerox Corporation | Sheet feeder having curved calibration strip |
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JP4038162B2 (en) | 2003-09-10 | 2008-01-23 | 株式会社リコー | Pressure plate mechanism, automatic document feeder, and image forming apparatus having the same |
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US4762994A (en) * | 1986-11-10 | 1988-08-09 | Ibm Corp. | Compact optical scanner driven by a resonant galvanometer |
US6229139B1 (en) * | 1998-07-23 | 2001-05-08 | Xros, Inc. | Handheld document scanner |
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Also Published As
Publication number | Publication date |
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US7852528B2 (en) | 2010-12-14 |
CN1988588A (en) | 2007-06-27 |
KR100677625B1 (en) | 2007-02-02 |
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